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Throughout the world, كايو (Caio , Kaio , Cayo ) is a widespread boy's forename. The first name كايو is habitual in Brazil, where it is quite a common male name, Peru, where it is quite a rare boy's name, and Portugal. In absolute terms, it is the most numerous in Brazil, Peru, and Philippines. Very seldom, كايو is the last name as well as the forename.
كايو is also a name for the fictitious and mythical characters: Caius Camillus , character in Kaamelott; Caio Fabbricio , the operatic character in the opera Cajo Fabrizio (Hasse) and Caio Fabbricio , the operatic character in the opera Caio Fabbricio (Händel).